Lockrun is a handy little utility for ensuring you don’t run two of the same cron job (or other task) at the same time on one machine. It’s especially handy when the cron job in question has a widely varying duration. Lockrun was written by Steve Friedl and initially released in 2006.

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Code:

def running(a)

running=`tasklist`

if running.include?(a)

puts “#{a} is already running in windows machine”

else

puts “#{a} is not running”

end

end

runnning(‘java.exe’)

#=>   java.exe is already running in windows machine

runnning(‘notepad.exe’)

#=> notepad.exe is not running

Where this code will useful:

We can able to chaeck the process is runnign or not — When Script need to close some opened Firefox windows or chrome windows